Write a short answer. What is the relationship between growth and cell division?
Answer
The life of all multicellular organisms begins with a single cell. This cell divided and redivides, thereby forming a cluster of many cells. So cell division is necessary for growth.
Write a short answer. Why are mitochondria called the powerhouse of the cell?
Answer
Mitochondria are the sites of respiration in the cell. Mitochondria forms energy in the form of ATP (Adenosine triphosphate) during the process of respiration. Therefore, they are called the powerhouse of the cell.
Write a short answer. Why is the cell membrane called selectively-permeable membrane?
Answer
The cell membrane is called selectively permeable membrane as it allows only selected substances to pass through it and prevents the passage of other substances.
Write a short answer. Why is a cell called the structural unit of a living organism?
Answer
A cell is called the structural unit of life because all living organism irrespective of their size, shape, and complexity are made up of cells and functions performed by the organism is the result of the activity of the cells in its body.